Update inputs after mfix-exa MR1456 (!119)

docs/source_docs/user_guide/inputs/output/monitors.rst

@@ -472,6 +472,8 @@ The following table lists all the solids phase variables that can be monitored:
 +==========================+=========================================================================================+
 | ones                     | value of :math:`\phi_p` is set to 1 for each solid particle                             |
 +--------------------------+-----------------------------------------------------------------------------------------+
+| k_energy                 | particles kinetic energy                                                                |
++--------------------------+-----------------------------------------------------------------------------------------+
 | position                 | particles position (all the three components)                                           |
 +--------------------------+-----------------------------------------------------------------------------------------+
 | pos_[x/y/z]              | x, y, or z component of the particles position                                          |